High strength corrosion resistant alloy for oil patch...

Details High strength corrosion resistant alloy for oil patch... High strength corrosion resistant alloy for oil patch...

2005-11-07

2008-08-26

Ip, Sikyin (Department: 1793)

Metal treatment

Stock

Age or precipitation hardened or strengthened

C148S428000, C420S448000

Reexamination Certificate

active

07416618

ABSTRACT:
A Ni—Fe—Cr alloy having high strength, ductility and corrosion resistance especially for use in deep-drilled, corrosive oil and gas well environments, as well as for marine environments. The alloy comprises in weight %: 35-55% Ni, 12-25% Cr, 0.5-5% Mo, up to 3% Cu, 2.1-4.5% Nb, 0.5-3% Ti, up to 0.7% Al, 0.005-0.04% C, balance Fe plus incidental impurities and deoxidizers. The alloy must also satisfy the ratio of (Nb-7.75 C)/(Al+Ti)=0.5-9 in order to obtain the desired high strength by the formation of γ′ and γ″ phases. The alloy has a minimum of 1% by weight γ″ phase dispersed in its matrix for strength purposes and a total weight percent of γ′+γ″ phases being between 10 and 30.

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Cayard, M.S. et al., “Serviceability of 13Cr Tubulars in Oil and Gas Production Environments”, 1998, 8 pp. NACE Paper No. 112,Corrosion 98, Houston, TX.
Hibner, Edward L. et al., “Comparison of Corrosion Resistance of Nickel-Base Alloys for OCTG's and Mechanical Tubing in Severe Sour Service Conditions”, 2004, 15 pp., NACE Paper No. 04110,Corrosion 2004, Houston, TX.

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